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Question
50 circular plates each of diameter 14cm and thickness 0.5cm are placed one above other to form a right circular cylinder. Find its total surface area?
Solution
Given that 50 circular plates each with diameter = 14cm
Radius of circular plates (r) = 7cm
Thickness of plates= 0.5
Since these plates are placed one above other so total thickness of plates = 0. 5 x 50
= 25cm.
Total surface area of acylinder = 2πrh + 2πr2
= 2πrh + 2πr2
= 2πr (h+r)
= 2 x 22/7 x 7(25+7)
T.S.A = 1408cm2
∴Total surface area of circular plates is 1408cm2
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